What's the point if you have to carry around massive quanties of distilled water, which is heavy and expensive? For a car to carry around an equal amount of water to its fuel, with the average gas tank about 18-20 gallons, thats 144-160 pounds of weight. Car radiators don't even come close to a quarter of that. Unless the extra power can maintain a better power/weight ratio with the extra weight (which would especially high for 18 wheelers, which would need hundreds of gallons to equal the fuel tanks), and unless its cheaper overall even with distilled water needed, there's no real point. Besides, a lot of the advantages he's claiming have yet to be proven.
Give me some real specs and hard data and I might be convinced.